Duct jack



M. HoYLE DUCT-JACK Nav. 17, '1942'.

Filed oct, 16, 1940 INVENTOR MMV/reza 6 Yayi ATTORNEY Patented Nov. 17, 1942 UNiTED STATES TENT OFFICE;

DUCT JACK Matthew Hoyle, Brooklyn, N. Y. Application October 16, 1940, Serial No. 361,446

3 Claims.

This invention relates to new and useful improvements in a duct jack.

The invention has for an object the construction of a duct jack which is characterized by a longitudinal support, guide members, a bar, and a clamp mounted in a specific way thereon.

Still further the invention contemplates arranging a guide member slidably on the support and providing the guide member with a duct support element, and connecting this guide member with a bar associated with a second guide member and having the clamp means previously named.

Still further the invention contemplates to so arrange the various parts that the guide member with the duct support element may be secured in various adjusted positions.

Still further the invention contemplates a novel construction of the clamp for accomplishing the securing previously mentioned,

For further comprehension of the invention, and of the objects and advantages thereof, reierence will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure- Fig. l is a side elevational View of a duct jack constructed in accordance with this invention.

Fig. 2 is a front elevational view of Fig. 1 but illustrated with the parts in a diierent position.

Fig. 3 is a horizontal sectional view taken upon the line 3 3 of Fig. 1.

is a perspective view of one of the guide members.

Fig. 5 is a fragmentary vertical sectional View of the top portion of a duct jack constructed in accordance with another form of this invention.

Fig. 6 is a horizontal sectional View taken on the line 6-6 of Fig. 5.

Fig. 7 is a perspective view of a used in Figs. 4 and 5.

Fig. 6 is another view similar to Fig, 4 but illustrating another form of the invention.

The duct jack, in accordance with this invention, includes a longitudinal support i0 which is adapted to be stationarily mounted on a wall, iioor7 ceiling. or other stationary part. A guide member II is slidably mounted on the support It and is provided with a duct support element i2. This duct support element is adapted to be attached to, or engaged beneath, or in any jack plate `formed in the bar of duct construction. Another guide member i3 is spaced from the first named guide member il and is xedly mounted on the support It by several fastening elements i4. These fastening elements comprise bolts and nuts engaged through the materials of the guide member I3 and the material of the support IQ.

A bar i5 is fixedly mounted on the rst named guide member il and extends along said support i0 and through the second named guide i3. Several fastening elements i6, such as bolts and nuts, are engaged through the material of the guide member I! and of the bar I5 for fixedly connecting these parts together. The guide member i3 is provided with a clamp for holding the support It! and the bar i5 in various longitudinal Xed positions relative to each other. This clamp includes a boit i1. passing through a longitudinally extending elongated slot I8 i5 and through openings formed in the support it and guide member 53. A wing nut I9 is threadedly engaged on the bolt I'l by which the bolt may oe loosened and drawn tight as required.

The guide member i i is in the form of a frame having side walls I Iab and end walls I lb connected together in an integral unit. The duct support element I2 is in the form of an extension formed on the bottom edge of one ci the end walls lib. A transverse partition ilc divides the compass between the walls into two sections. The bottom end of the support It freely engages within one of these sections so that the guide member may slide up and down on the support. The lower end of the bar i5 engages into the other section. As previously stated, the bolts It xedly connect the bar I5 with the guide member Ii.

The guide member I3 is in the form of a frame having side walls Isa, an end 1vall VS2 connecting together one of the ends of the side walls, and end wall sections I3c continuing from the other ends of the side walls and partially extending across the outer face of the bar I5. The head of the bolt I'I is located between the end wall sections I3c. A washer I9 is engaged beneath the head Ila of the bolt I'i. This washer extends across the slot I8 and engages the material to the sides of the slot. The guide member I3 is provided with a central partition i3d dividing it into two sections. The upper end of the support I0 engages one of these sections and at this point is held by the bolt I4. The upper end of the bar I5 slidably engages into the other section of the other manner support an air duct or other type guide member.

The operation of the device is as follows:

The support is attached to a wall or other surface and the wing nut I9 may be loosened and then the bar I5 and the guide member II which is attached to the bar may be adjusted relative to the support I to any desired degree, for eX- ample, to the position as illustrated in Fig. 2 to cause the duct support element I2 to engage flush against the bottom face of the air duct to be supported. Then the wing nut I9 may be tightened to cause the bolt i7 to clamp the parts in their new positions and support the air duct against sagging. An important feature of the construction resides in the provision of the partitions I Ic and I3d which hold the support Iii and bar I5 properly spaced and serve to guide the relative movements of these parts.

In Figs. 5 to '7 inclusive, a modified form of the invention has been disclosed which distinguishes from the prior form in the fact that a clamp plate 22 is movably mounted in one of the sections of the top guide member I3', and is cooperative with a plurality of pins 23 in a certain manner to facilitate the action of the clamp. More specifically, the pins 23 project from the partition I3d. The plate 22 has lugs 24 at its ends engaging into openings 25 formed in the side walls I 3a of the guide member. The pins 23 are aligned with and extend into openings 25 formed in the plate 22. Several springs 21 urge the plate 22 away from the partition I 3d. The bar I5 is disposed between the side walls |321, the end wall sections 30 and the plate 22.

When the wing nut I9 is screwed down tightly, the bar I5 will be iiexed slightly and move towards the partitions ld so that the pins 23 dig into and grip the bar, as illustrated in Fig. 5. This insures the tight gripping and holding of the clamp. When the wing nut I9 is screwed loose the flexibility oi the bar I5 and the springs 2'! will move the plate 22 away from the partition I3d so that the pins 23 disengage from the bar I5. The bar I5 is now free to be adjusted for the reasons previously described.

In Fig. 8 the support I0 and the bar I5 are illustrated in the guide member Ii without any transverse partition. In this guide member, the support it and the bar I5 are slightly separated to permit relative sliding motion of same without any friction between them.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise construction herein disclosed and the right is reserved to all changes and modications coming within the scope of the invention as dened in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. In a duct jack having a rectangular guide member xedly mounted on one end of a support and having a bar slidably extended therethrough, an opening extending transversely through said support, a clamp screw passing through an elongated slot in said bar and said opening, a partition integrally formed on said guide member and disposed between the adjacent faces of said support and said bar, and pins xedly mounted on one face of said partition and directed towards said bar, whereby when said clamp screw is tightened said bar will be drawn towards said partition causing said pins to enter the sides of said bar when said bar is in any one of several adjusted positions relative to said support to lock said bar against movement relative to said support.

2. In a duct jack having a rectangular guide member xedly mounted on a support and having a bar slidably extended therethrough and a clamp screw passing through an elongated slot in said bar and an opening in said support, a partition integrally formed in said guide member and disposed between the adjacent faces of said support and bar, and pins mounted on one face of said partition and directed towards said bar, whereby when said clamp screw is tightened said bar will be drawn towards said partition causing said pins to enter the sides of said bar in various adjusted positions of said bar relative to said support and lock said bar against movement relative to said support, and means for urging said bar away from said partition as said clamp screw is loosened disengaging said pins from said bar thereby freeing said bar to permit it to be moved relative to said guide member and support.

3. In a duct jack having a rectangular guide member ixedly mounted on a support and having a bar slidably extended therethrough, a clamp screw passing through an elongated slot in said bar and a transversely extending opening in said support, a partition integrally formed in said guide member and disposed between the adjacent faces of said support and said bar, a plurality of pinsmounted on one face of said partition and directed towards said bar, whereby when said clamp screw is tightened said bar will be drawn towards said partition causing said pins to enter a side of said bar when said bar is in any one of several adjusted positions with respect to said support and lock said bar against movement relative to said support, a plate slidably mounted on said guide member having a plurality of openings and in alignment with said pins, said pins extending through said plate for engagement with said bar, said plate being positioned intermediate said bar and said partition, and means tending to continually urge said plate and said bar away from the adjacent face of said partition.

MATTHEW HOYLE. 

